444, MAZATLAN UNIVALVES 
specimens, by the state of the mouth, indicate maturity ; por- 
tions were found of a very few others. ong. (anfr. nuel. 
decol.) °073, long. spir. 05, lat. ‘032, div. 30°. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; Z’pool Col. 
Tablet 2031 contains 2 sp. one with complete mouth, the 
other with complete apex ; also an adult labral fragment, which 
may belong to this species. 
560. CreritHropsis SoREX, 2. s. 
C.t.“C. pupiformi” simili, sed multo minore, tumidiore, gib- 
bosé ; marginibus spire maxime excurvatis ; anfr. vil. quarum 
dimidium nucleosum est, maxime prominens, love: anf. normali- 
bus subito tumentibus, planatis, suturd via impressd 3 carinis 
tumentibus iv., ill. in spird maxime tuberculosis, und ad peri- 
pheriam subtuberculosd; strits in basi pluribus ; labro contracto, 
labio conspicuo ; albida, purpureofusca fasciata. 
This remarkable shel! looks like a fat Shrew with a promin- 
ent snout. It is quite adult, but it probably varies in colour 
and compactness. Long. ‘063, long. spir. ‘043, long. nucl. °01, 
lat. ‘027, lat. nuel. °007, div. maxime variante. 
Hab.—Mazatlan ; 4 sp. off Spondylus ; £’pool Col. 
Tablet 2032 contains a fresh and beautifully coloured speci- 
men. 
561. CERITHIOPSIS CONVEXA, 7. S. 
C. t. gracili, albo-fuscd, marginibus spire vectis; anfr. X. 
normalibus, valde convexis, suturd profundd, eleganter cancel- 
latis ; costis spiralibus iv., super costas radiantes circiter Xi. 
undulantibus, ad intersectiones subnodosis ; tnterstitiis quadra- 
tis, intus concavis ; carina circé peripheriam haud tuberculosa ; 
bast concava, sublevi; aperturd rotundata; labio distincto, 
haud prominente, rimam umbilicalem formente. 
This beautiful species is cancellated as in Phos; and is 
remarkable for the convexity of the whirls. The nuclear 
whirls are decollated. Long. °18, long. spir. ‘146, lat. *056, 
div. 12°. 
Hab.—Mazatlan ; 1 fresh sp. off Spondylus ; L’pool Col. 
Tablet 2033 contains the specimen. 
